Automatic package machine, and wrapping film fusing and sealing blade

Abstract

The object of this invention is to provide an automatic package machine comprises a roll of wrapping film, a film opener for opening the film, which is drawn from the roll, into such a shape that the film can wrap an article to be wrapped, a conveyer for introducing the article, which is to be wrapped, into the opening of the film opened by the film opener, and a sealing unit situated contiguously to a downstream end of the conveyer for sealing edge portions of the film opening. The sealing unit includes a heater body, a fusing and sealing blade projecting from one end of the heater body, being vertically adjustable solely or together with the heater body, and being penetrable into the edge portions of the film opening parallel to a travelling path of the film, and two pairs of upper and lower feed rollers situated upstream and downstream, respectively, of the fusing and sealing blade. The fusing and sealing blade has along at least its upstream side edge a cutting edge.

What is claimed is: 
     
       1. An automatic package machine comprising: (a) a roll of wrapping film;   (b) a film opener for opening the film, which is drawn from said roll, into such a shape that the film can wrap an article to be wrapped;   (c) a conveyer for introducing the article, which is to be wrapped, into the opening of the film opened by said film opener; and   (d) a sealing unit situated contiguously to a downstream end of said conveyer for sealing edge portions of the film opening, said sealing unit including a heater body, a fusing and sealing blade being heated by said heater body, projecting from one end of said heater body, being vertically adjustable solely or together with said heater body, and being penetrable into the edge portions of the film opening parallel to a travelling path of the film, and two pairs of upper and lower feed rollers situated upstream and downstream, respectively, of said fusing and sealing blade, said fusing and sealing blade having along at least its upstream side edge a cutting edge.   
     
     
       2. An automatic package machine according to claim 1, wherein said cutting edge of said fusing and sealing blade has a generally V shape in either cross-section or horizontal cross section, the angle of the V shape of said cutting edge being within a range of 5 to 15°. 
     
     
       3. An automatic package machine according to claim 1, wherein said cutting edge is formed along only a distal end of the edge of said fusing and sealing blade. 
     
     
       4. An automatic package machine according to claim 1, wherein said cutting edge is formed along the entire edge of said fusing and sealing blade. 
     
     
       5. An automatic package machine according to claim 1, wherein said downstream feed rollers are rotatable at a rotational speed higher than the rotational speed of said upstream feed rollers. 
     
     
       6. An automatic package machine comprising: (a) a roll of wrapping film;   (b) a film opener for opening the film, which is drawn from said roll, into such a shape that the film can wrap an article to be wrapped;   (c) a conveyer for introducing the article, which is to be wrapped, into the opening of the film opened by said film opener; and   (d) a sealing unit situated contiguously to a downstream end of said conveyer for sealing edge portions of the film opening, said sealing unit including fusing means for fusing the edge portions of the film opening parallel to a travelling path of the film, and electrostatically charging means situated adjacent to the edge portions of the film opening between near said conveyer and said fusing means.   
     
     
       7. An automatic package machine according to claim 6, wherein said fusing means includes a heater body and a fusing and sealing blade being heated by said heater body, projecting from one end of said heater body, being vertically adjustable solely or together with said heater body, and being penetrable into the edge portions of the film opening parallel to the travelling path of the film, said fusing and sealing blade having at least along its upstream side edge a cutting edge. 
     
     
       8. An automatic package machine according to claim 6, wherein said cutting edge of said fusing and sealing blade has a generally V shape in either cross-section or holizontal cross section, the angle of the V shape of said cutting edge being within a range of 5° to 15°. 
     
     
       9. An automatic package machine according to claim 6, wherein said cutting edge is formed along only a distal end of the edge of said fusing and sealing blade. 
     
     
       10. An automatic package machine according to claim 6, wherein said cutting edge is formed along the entire edge of said fusing and sealing blade. 
     
     
       11. An automatic package machine according to claim 6, wherein said fusing means including the heater body, a bar-shaped fusing and sealing blade projecting from one end of said heater body, being vertically adjustable solely or together with said heater body, and being penetrable into the edge portions of the film opening downwardly from the travelling path of the film, said barshaped fusing and sealing blade being tapered toward its lower end. 
     
     
       12. A fusing and sealing blade for use in an automatic package machine including a roll of wrapping film, a film opener for opening the film, which is drawn from the roll, into such a shape that the film can wrap an article to be wrapped, a conveyer for introducing the article, which is to be wrapped, into the opening of the film opened by the film opener, and a sealing unit situated contiguously to a downstream end of the conveyer for sealing edge portions of the film opening, wherein said fusing and sealing blade is projecting from one end of a heater body of the sealing unit and is vertically adjustable solely or together with the heater body, and is penetrable into the edge portions of the film opening parallel to a travelling path of the film, said fusing and sealing blade having along at least its upstream side edge a cutting edge. 
     
     
       13. A fusing blade according to claim 12, wherein said cutting edge has a generally V shape in either cross section or holizontal cross section, the angle of the V shape of said cutting edge being within a range of 5° to 15°. 
     
     
       14. A fusing blade according to claim 12, wherein said cutting edge is formed along only a distal end of the edge of said fusing and sealing blade. 
     
     
       15. A fusing blade according to claim 12, wherein said cutting edge is formed along the entire edge of said fusing and sealing blade. 
     
     
       16. A fusing blade according to claim 12, wherein said cutting edge has on one side a cutting surface and on the other side a perpendicular surface, in which case the cutting surface is situated toward the article to be wrapped.